package com.tanhua.dubbo.server.api;

import com.alibaba.dubbo.config.annotation.Service;
import com.tanhua.dubbo.server.pojo.RecommendUser;
import com.tanhua.dubbo.server.vo.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;

import java.util.List;

@Service(version = "1.0.0")
public class RecommendUserApiImpl implements RecommendUserApi {

    @Autowired
    private MongoTemplate mongoTemplate;

    /**
     * 查询得分最高的
     * @param userId
     * @return
     */
    @Override
    public RecommendUser queryWithMaxScore(Long userId) {
        // 查询得分 最高的用户，按照得分的降序排序
        Query query = Query.query(Criteria.where("toUserId").is(userId))
                .with(Sort.by(Sort.Order.desc("score")))
                .limit(1);
        return this.mongoTemplate.findOne(query,RecommendUser.class);
    }


    /**
     * 分页查询
     *
     * @param userId
     * @param pageNum
     * @param pageSize
     * @return
     */
    @Override
    public PageInfo<RecommendUser> queryPageInfo(Long userId, Integer pageNum, Integer pageSize) {

        //分页查询且倒序
        PageRequest pageRequest = PageRequest.of(pageNum - 1 , pageSize , Sort.by(Sort.Order.desc("score")));

        //查询参数
        Query query = Query.query(Criteria.where("toUserId").is(userId)).with(pageRequest);

        List<RecommendUser> recommendUsers = this.mongoTemplate.find(query, RecommendUser.class);

        // 暂时不提供数据总数
        return new PageInfo<>(0 , pageNum ,pageSize ,recommendUsers);
    }
}
